Compilare: main.cpp: In function 'void kmp(std::__cxx11::string&)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = na + 1; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:44:6: warning: unused variable 'nb' [-Wunused-variable] int nb = b.size(); ^~